791 reputation
314
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location Spain
age 26
visits member for 1 year, 7 months
seen 18 hours ago
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Undergraduate physics student at Spain.


22h
reviewed No Action Needed Widom-Larsen Theory
22h
reviewed No Action Needed Periodic boundary condition on a Wave Function of a Particle in a Box
22h
suggested suggested edit on Periodic boundary condition on a Wave Function of a Particle in a Box
23h
reviewed No Action Needed How to calculate beam spread of a non-point light source via an aspheric lens
23h
awarded  Critic
23h
reviewed Reviewed How a spacecraft travelling near light speed avoid asteroids?
2d
comment Optical depth in astrophysics
Understood, thank you very much!
2d
comment Optical depth in astrophysics
Hi Christ, thanks. I'm still stuck seeing why your first ODE holds. The following steps are cristal clear.
2d
asked Optical depth in astrophysics
May
1
answered Ricci tensor for a 3-sphere without Math packets
Mar
28
comment How to solve following equation (Yukawa field)?
Probably Green function for the homogeneous equation is the way to go, then plug in your $j^{\alpha}$
Mar
25
comment N-electron system ground state
Yes, in this level of calculation your energy depends on $k^2$ and $k^2$ only, as you can see in the $E_{k}$ explicit expression
Mar
25
answered N-electron system ground state
Mar
22
accepted Product of exponential of operators
Mar
20
accepted Annihilation and creation operator - $\phi$ and $\pi$ for Klein-Gordon Field
Mar
20
asked Product of exponential of operators
Mar
20
comment Find $x$ operator given $p$
@JKL No, it is not give but it should be something like $[x,A+B]=Ci\hbar$ for some $C$
Mar
20
accepted Weinberg's proof that Levi-Civita Symbol is a tensor
Mar
19
comment Weinberg's proof that Levi-Civita Symbol is a tensor
Hi, thanks. I'm sorry but I still don't get it.. when I switch $\epsilon$ and $\zeta$ in the Levi-Civita symbol I add a minus sign, and the indices in the Lorentz transformation should be switched too. Then how I relabel the dummy indices? switching back $\zeta$ to $\epsilon$?
Mar
19
asked Weinberg's proof that Levi-Civita Symbol is a tensor